Showing papers by "Alexei O. Orlov published in 2020"
TL;DR: In this article, the authors demonstrate that by carefully choosing the operating point, the response to the voltage on the sensing gate can be enhanced, for small arrays scales, by a factor approaching N and, thus, provide a method by which these devices can be used in practical sensing applications, such as a scanning probe.
Abstract: Single-electron tunneling transistors (SETs) and boxes (SEBs) belong to the family of charge-sensitive electronic devices based on the phenomenon of Coulomb blockade. An SEB is a two-terminal device composed of “leaky,” C j, and “non-leaky,” C g, nanoscaled capacitors in series. At low temperatures, the charge at the common node is quantized and can only be changed near energy-population degeneracy points, resulting in periodic oscillations of the SEB admittance as a function of voltage applied to C g. In comparison to the SETs, SEBs have higher operating temperature, are electrostatic discharge tolerant, and have a much smaller footprint. To monitor the SEB admittance, Radio Frequency reflectometry can be used. To improve the signal-to-noise ratio, limited by the small change in admittance in an SEB, multiple devices sharing the same source and gate electrodes are connected in parallel to form arrays of SEBs. Due to unavoidable random offset charges, the signal boost for an array of N SEBs is expected to be ∼ N. We experimentally demonstrate that by carefully choosing the operating point, the response to the voltage on the sensing gate can be enhanced, for small arrays scales, by a factor approaching N and, thus, provides a method by which these devices can be used in practical sensing applications, such as a scanning probe.
4 citations
13 Jun 2020
TL;DR: In this article, the gap-closing voltage-controlled variable capacitors are used as pull-up and pull-down networks to eliminate leakage current and therefore is not limited by passive power.
Abstract: Reversible computing is a promising approach to energy efficient computing that reduces heat generation by introducing a trade-off between energy and speed The most developed approach to reversible computing is adiabatic CMOS, but its lowest energy dissipation is still limited by passive power, the energy wasted due to leakage current caused simply by applying a voltage to the circuit A new approach, Adiabatic Capacitive Logic (ACL), implements reversible computing by using variable capacitors as pull-up and pull-down networks ACL eliminates leakage current and therefore is not limited by passive power We present the design and proposed nanofabrication of gap-closing voltage-controlled variable capacitors to implement ACL as a future computing approach
4 citations
TL;DR: It is shown that it is possible to design SEB arrays that may compete with an SET in terms of sensitivity, and the lack of a path for a DC current makes SEBs and DCD SETs highly electrostatic discharge (ESD) tolerant, a very desirable feature for applications.
Abstract: Single-electron tunneling transistors (SETs) and boxes (SEBs) exploit the phenomenon of Coulomb blockade to achieve unprecedented charge sensitivities. Single-electron boxes, however, despite their simplicity compared to SETs, have rarely been used for practical applications. The main reason for that is that unlike a SET where the gate voltage controls conductance between the source and the drain, an SEB is a two terminal device that requires either an integrated SET amplifier or high-frequency probing of its complex admittance by means of radio frequency reflectometry (RFR). The signal to noise ratio (SNR) for a SEB is small, due to its much lower admittance compared to a SET and thus matching networks are required for efficient coupling ofSEBs to an RFR setup. To boost the signal strength by a factor of N (due to a random offset charge) SEBs can be connected in parallel to form arrays sharing common gates and sources. The smaller the size of the SEB, the larger the charging energy of a SEB enabling higher operation temperature, and using devices with a small footprint ( 1000) can be assembled into an array occupying just a few square microns. We show that it is possible to design SEB arrays that may compete with an SET in terms of sensitivity. In this, we tested SETs using RF reflectometry in a configuration with no DC through path (“DC-decoupled SET” or DCD SET) along with SEBs connected to the same matching network. The experiment shows that the lack of a path for a DC current makes SEBs and DCD SETs highly electrostatic discharge (ESD) tolerant, a very desirable feature for applications. We perform a detailed analysis of experimental data on SEB arrays of various sizes and compare it with simulations to devise several ways for practical applications of SEB arrays and DCD SETs.
3 citations
13 Jun 2020
TL;DR: In this article, the authors study thermoelectric signal generation by suspended nano-antenna thermopiles in response to amplitude-modulated long-wave infrared radiation and show that the limiting factor of the response time is not the inverse RC time constant of the array but rather the thermal response of the nanostructure.
Abstract: We study thermoelectric signal generation by suspended nanoantenna thermopiles in response to amplitude-modulated long-wave infrared radiation. We experimentally demonstrate response times on the order of a few μs with a signal bandwidth of about 200 kHz. Analytical calculation and simulation results show that the limiting factor of the response time is not the inverse RC time constant of the array but rather the thermal response of the nanostructure.
2 citations
TL;DR: Both experiments and simulations show a key trade-off between sensitivity and response time for such structures and provide solutions for specific target applications.
Abstract: We investigate the generation of electrical signals by suspended thermoelectrically coupled nanoantennas (TECNAs) above a quasi-spherical reflector cavity in response to rapidly changing long-wave infrared radiation. These sensors use a resonant nanoantenna to couple the IR energy to a nanoscale thermocouple. They are positioned over a cavity, etched into the Si substrate, that provides thermal isolation and is designed as an optical element to focus the IR radiation to the antenna. We study the frequency-dependent response of such TECNAs to amplitude-modulated 10.6 μm IR signals. We experimentally demonstrate response times on the order of 3 μs, and a signal bandwidth of about 300 kHz. The observed electrical response is in excellent correlation with finite element method simulations based on the thermal properties of nanostructures. Both experiments and simulations show a key trade-off between sensitivity and response time for such structures and provide solutions for specific target applications.
1 citations
21 Jun 2020
TL;DR: One approach to using spin waves is to convert millimeter or microwave electrical signals to spin waves having micrometer wavelengths, which are then converted back into electrical signals.
Abstract: Spin waves show potential as an alternative to electric current for computing and signal processing, which require low-power and small size. One approach to using spin waves is to convert millimeter or microwave electrical signals to spin waves having micrometer wavelengths. All signal processing is then done by the diffraction and interference of spin waves traveling through a magnetic thin film. These waves are then converted back into electrical signals [1] , [2] .
1 citations
13 Jun 2020
TL;DR: In this paper, a new class of device has been proposed that converts millimeter electrical signals into spin waves with micrometer wavelengths, with which computing can be done in a small footprint.
Abstract: A new class of device has been proposed that converts millimeter electrical signals into spin waves with micrometer wavelengths, with which computing can be done in a small footprint. The spin waves are then converted back into electrical signals. Essential for this is the design of proper transducers between the two domains. We have simulated an electrical-to-spin-wave transducer that shows improved bandwidth. We are developing a numerical simulation design tool that crosses between these domains.
1 citations